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API use can vary depending on the type of programming language involved. An API for a procedural language such as Lua could consist primarily of basic routines to execute code, manipulate data or handle errors while an API for an object-oriented language , such as Java, would provide a specification of classes and its class methods .
There are two types of Java programming language application programming interfaces (APIs): The official core Java API, contained in the Android (Google), SE (OpenJDK and Oracle), MicroEJ. These packages (java.* packages) are the core Java language packages, meaning that programmers using the Java language had to use them in order to make any ...
The Windows API is a C language-based API. [12] Functions and data structures are consumable via C syntax by including windows.h, but the API can be consumed via any programming language that can inter-operate with the API data structures and calling conventions for function calls and callbacks.
In most cases, an FFI is defined by a higher-level language, so that it may employ services defined and implemented in a lower-level language, typically a system programming language like C or C++. This is typically done to either access operating system (OS) services in the language in which the OS API is defined, or for performance goals.
An example of a popular web API is the Astronomy Picture of the Day API operated by the American space agency NASA. It is a server-side API used to retrieve photographs of space or other images of interest to astronomers, and metadata about the images. According to the API documentation, [15] the API has one endpoint:
There are two previous major description languages: WSDL 2.0 (Web Services Description Language) and WADL (Web Application Description Language). Neither is widely adopted in the industry for describing RESTful APIs, citing poor human readability of both and WADL being actually unable to fully describe a RESTful API.
Common Language Runtime, Common Type System, Global Assembly Cache, Microsoft Intermediate Language, Windows Forms; ADO.NET, ASP.NET; Windows Communication Foundation (WCF) Windows Presentation Foundation (WPF) Windows Workflow Foundation (WF) Windows CardSpace (WCS) Universal Windows Platform (UWP) Windows PowerShell; Microsoft Management ...
In assembly, C, C++, Pascal, Modula2 and other languages, a callback function is stored internally as a function pointer. Using the same storage allows different languages to directly share callbacks without a design-time or runtime interoperability layer. For example, the Windows API is accessible via multiple languages, compilers and assemblers.